Method of bending printing-surfaces.



B'. F. UPHAM. METHOD 0F BBNDING PRINTING SURPAGBS.

APYLIOATION I'LBD JALSO. 190B.

gl o Patented Sept. 1'?, 1912.

Figi F1929 BRT F. UPHAM, DE BOSTON, MASSACHUSETTS, ASS'IG-NOR TO SOUTHGATE MACHINERY CO., OF BOSTQN, MASSACHUSETTS, A CORPORATIGN OF MASSACHTJ'SE'ITEES.l

METHOD 0F BENDING PRINTING-SITEFACES.

Specification of Letters Patent.

resented sept. rr, reis.

application inea January no, ieee'. serial No. 413,389.

To all whom if) may concern .Q

\ ,Be it known that I, BUn'r F. UPHAM,` a citizen of the United States, residing at Boston, in the county of Suffolk and Common` Wealth of Massachusetts, have invented certain new and useful Improvements in Methods of Bending Printing-Surfaces, of which the following is a full, clear, and' exact description.

rlhe object of this invention is the effecting of imprbved means for producing duplicate fiat and curved printing surfaces which shall be able to print exactly registering impressions, for use particularly upon cylinder presses having an auxiliary cylindrical printing surface such as set forth in my patent numbered 909,260, granted dan. 12, 1909. rlhe necessity for my process arises from the fact that When a backed electrotype shell is curved for use upon such a press, the printing surface is materially elongated, and hence will not register with the impressions madeby the fiat type mat-- ter." In my previous methods for correcting such distortion, disclosed in my patents numbered 909,832, 906,586'and 903,342, the electrotype 'shells are treated after their format-ion. In my present process, the treatment begins with the mold or matrix in which the shell is to be made.

Referring to the drawings forming part of this specification, Figure -1 is an edge view of a mold or matrix made in the usual way by forcing a printing surface into a sheet of Wax or lead; F ig. 2 represents this matrix bent upon a curved surface. Fig. 3 shows the matrix'in the operation of having a shell elec I plated thereon. Fig. el is au edge view of the shell thus made, after it has been flattened and backed up to tit it for use upon the flat hed of a cylinder press.

lln Fig. 1, the reference numeral 1 desig` nates a mold ry matrix of Wax, lead mch or othe material, into the surface of which a Arinti'afig surface has been forced in the usua manner, and an obverse impression or mold 2 formed therein. This matrix is then laid upon a curved surface of proper radius, with its face 2 outward, and bent to,-

spier conform thereto. This of course elongaiss the said face, and shortens the inner surface' of the mold; the amount of such elongation'I beine determined by the thickness of the mol and the curvature of the surface 3,.but such amount being arranged to exactl ef ual 5E. the elongation which is given to the bac ed" electrotype plate when it is bent in' the .usual way to fit the cylinder upon which it is to be''f'- used. This curved mold is thenrsubmer 'e in an electrotyping bath 4, indicated tig.V

8, and a shell electroplated thereon inthe customary manner. The mold bengwtlibn removed and this shell stripped'theref such shell 5 is flattened by laying on splint; surface, and giving a backing 6 in the refill lar way. As this shell retains the elongation?- given to the mold-surface 2, it Will register with the distorted electrotype plate curved for the press cylinder in the ordinary man ner. This manner consists in making a mold from the original flat printing surface mf the same Way as above described; then tak-` ing an electrotype shell from said mold backing up said shell, and finally curving` said backed shell. to tit the cylinder; such curving being done with Athe shell/outward. What I' claim as my invention and for which I desire Letters Patent is as follows,

to wit;- v

The herein described method of producing electrotype plates which register with each other, the same consisting in making a mold from an original fiat plate, ltaking' an electrotype shell from said mold, backing it up and then curving it to tit the cylinder' for which it is desired, taking a moldfrom said original plate and rcurving it, taking an electroty e shell from the last-named mold, removing such shell and attening it Y and then backmg it up flat, whereby sai curved electrotype and said liat electrotype shall mutually register. g

In testimony thatl claim the fore invention, l have hereunto set my han 28th day of .l anua1y,t}8.

-BURT r. UPHAM.

oingw 1 this Witnesses:

A". B. UPHAM, M. C. GATES. 

